I have been asked to track the signal performance of Atrix 2. Rather than just say it's good or bad I would like some kind of app to track signal with GPS locations every 10 seconds or so. I will stop logging when I am stationary. Then export the data in KML format or something. Anyone recommend a free app to do this?

Have a look at http://sensorly.com . It maps your network then uploads it to their site, from where you can look at coverage of all nz providers. Because other people have also mapped coverage their maybe already some data for the area you want.

Not sure if that's what you're exactly suits your need but is a nice app.